CVE-2026-66582 in TranslatePress Plugin
Summary
by MITRE • 08/20/2026
Unauthenticated Cross Site Scripting (XSS) in TranslatePress <= 3.3.2 versions.
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Analysis
by VulDB Data Team • 08/20/2026
The vulnerability identified as an unauthenticated cross-site scripting flaw within TranslatePress versions prior to or equal to 3.3.2 represents a significant security risk for websites utilizing this WordPress plugin. Cross-site scripting, commonly referred to by its acronym XSS, is a web security vulnerability that allows an attacker to inject malicious scripts into web pages viewed by other users. In the specific context of TranslatePress, which serves as a translation management tool for multilingual sites, the flaw stems from insufficient input validation and output encoding mechanisms within the plugin's codebase. This deficiency permits attackers to execute arbitrary JavaScript in the context of the victim’s browser without requiring any form of authentication or prior login credentials. The unauthenticated nature of this vulnerability is particularly severe because it lowers the barrier for entry significantly, allowing anyone with access to the target website to exploit the flaw rather than limiting attacks to authenticated administrators or editors who might have higher privilege levels but are harder to compromise initially.
From a technical perspective, the root cause lies in how user-supplied data is processed and rendered by the application. When input fields or parameters controlled by an external actor are reflected back into the HTML output without proper sanitization, the browser interprets the injected content as executable code rather than plain text. This typically occurs when developers fail to escape special characters such as angle brackets, quotes, and ampersands that have specific meanings in HTML and JavaScript contexts. In the case of TranslatePress 3.3.2 and earlier versions, certain endpoints or form submissions likely accepted raw input directly into dynamic content generation routines. By crafting a malicious payload containing script tags or event handlers like onload or onerror, an attacker can trigger execution when another user views the affected page. This mechanism bypasses same-origin policies because the code runs within the domain of the vulnerable site, granting it access to cookies, session tokens, and other sensitive data stored locally by the browser.
The operational impact of this vulnerability extends beyond simple script execution. An attacker leveraging this flaw can perform a variety of malicious actions that compromise user confidentiality and integrity. These include stealing administrative credentials through cookie theft, performing unauthorized state-changing requests on behalf of authenticated users, defacing website content, or redirecting victims to phishing sites designed to harvest sensitive information. Since TranslatePress is often used by site administrators to manage translations, an attacker could potentially manipulate translation strings displayed to end-users, leading to misinformation or brand damage. Furthermore, if the vulnerability allows for stored XSS where malicious scripts are saved in the database and served to subsequent visitors, the impact becomes persistent and affects every user who accesses the compromised content, amplifying the scale of potential harm significantly compared to reflected variants that require social engineering tactics like phishing links.
Industry standards provide a framework for understanding and mitigating such vulnerabilities. This flaw aligns with CWE-79, which is classified as Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific characteristic of being unauthenticated places it in the category where no prior access control checks are required to trigger the exploit. In terms of offensive security tactics, this vulnerability maps directly to MITRE ATT&CK technique T1059, specifically sub-technique 007 for JavaScript execution within a browser environment. It also relates to TA0006, Credential Access, if used for cookie stealing, and TA0002, Execution, by running arbitrary code on the client side. Understanding these mappings helps security teams categorize the risk accurately and prioritize remediation efforts based on established threat intelligence frameworks rather than treating it as an isolated coding error.
Mitigation strategies must focus on both immediate patching and long-term secure development practices. The most effective and urgent action is to upgrade TranslatePress to a version newer than 3.3.2, where the developers have presumably addressed the input validation gaps responsible for this flaw. Organizations should verify their plugin versions regularly through automated scanning tools or manual checks within the WordPress dashboard environment. Beyond patching, implementing Content Security Policy headers can provide an additional layer of defense by restricting the sources from which scripts are allowed to load and execute, thereby neutralizing many XSS payloads even if they manage to be injected into the DOM. Developers should also adhere to strict input validation principles, ensuring that all user inputs are validated against expected formats before processing, and apply output encoding appropriate for the context in which data is rendered, whether it be HTML body text, attribute values, or JavaScript variables. Regular security audits and code reviews focusing on these areas will help prevent similar vulnerabilities from being introduced into future releases of web applications.